St. Just-in-Penwith (Cornish: Lannust) is a town and civil parish in the Penwith district of Cornwall, England. It lies along the B3306 road which connects St. Ives to the A30 road. The parish encompasses the town of St Just and the nearby settlements of Trewellard, Pendeen, Carnyorth and Kelynack. It is bounded by the parishes of Morvah to the north-east, Sancreed and Madron to the east, St. Buryan and Sennen to the south and by the sea in the west. The parish consists of 7,622 acres (3,085 hectares) of land, 12 acres (4.9 hectares) of water and 117 acres (47.3 hectares) of foreshore. The town of St Just is the most westerly town in mainland Britain and is situated approximately 8 miles (13 km) west of Penzance along the A3071. St Just parish has a population of 4690.
The ancient settlement has a strong mining history and was, during the 19th century, one of the most important mining districts in Cornwall both for copper and tin. Mines within the area included Boscaswell Downs, Balleswidden, Parknoweth, Boscean, Wheal Owles, Wheal Boys, Levant, Botallack and Geevor (which closed in 1990). The boom in 19th century mining saw a dramatic increase in the population of St Just, the 1861 census records the population figure as being 9,290, however like other areas in Cornwall the population declined with the collapse in the tin trade in the 20th century.
St. Just was originally part of the Penzance Poor Law Union until 1894 when it was incorporated into the West Penwith Rural District. In 1897 St. Just-in-Penwith parish formed the sole basis of St. Just Urban District. In 1974 the urban district became part of Penwith District Council, until its abolition in 2009 (when Cornwall became a unitary authority).
One of the many maps available on A Vision of Britain through Time is one from the Ordnance Survey Series of 1900 illustrating the parish boundaries of Cornwall at the turn of the 20th century. This map blows up to show all the parishes and many of the small villages and hamlets.
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